BULL. GEOL. SOC. AM. 



VOL. 24, 1912, PL. 29 



Figure 1. — A rock Fall in the Bighorn Dolomite 

 This rock fall is near the head of the Gros Ventre River. Steamboat Peak in the distance 



Showing tin 



Figure 2. Glaciated Outcrop op the Bighorn Dolomite 



igated upright structures Interpreted as the remains of calcareous algae. 

 is 6 Inches long. Head of Dry Creek in the Gros Ventre Range 



The ruler 



BIGHORN DOLOMITE 



